PDF malware analysis — malicious · 917be65bf6e14e79

MALICIOUS

PDF

15.6 KB

MD5: e62e40532f1a3826a0579ba59ebfca81 SHA-1: 11a2b698309fcc2772f9a99170a7fbda07209eb6 SHA-256: 917be65bf6e14e7934b09d40226cc598a41f738cd382420d749e78316ac9fd82

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript (legacy_pdfkit_stage_000.js) appears to be responsible for downloading and executing a second-stage payload, although the exact URL or execution method could not be fully reconstructed due to obfuscation. The presence of JavaScript actions and eval() calls points to a malicious script execution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `58d003383caea4e993f0af97ce6507a14765c2182467738c5130c3fed5cd77a1`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `18d065bcd44e6aa2fd796205c31d4d36c89322365d2a5c55e33e74ee68e6ff87`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AAD	11532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.